Base API Quick Start Guide

BlockEden.xyz provides high-performance infrastructure for Base, Coinbase's Layer 2 solution built on the OP Stack. Access Base's ultra-low fees and enterprise-grade security through our global API endpoints with sub-second response times.

What is Base?

Base is Coinbase's Layer 2 blockchain that brings the next billion users onchain:

Ultra-Low Fees: Transactions cost fractions of a penny
EVM Compatibility: Full Ethereum tooling and smart contract support
OP Stack Technology: Built on Optimism's proven infrastructure
Enterprise Security: Backed by Coinbase's institutional-grade infrastructure
No Native Token: Uses ETH for gas fees, simplifying the user experience
Instant Finality: Fast transaction confirmation with L2 scaling

API Endpoints

BlockEden.xyz supports all Base API methods through our global infrastructure:

Mainnet

JSON-RPC: https://api.blockeden.xyz/base/<your-api-key>
WebSocket: wss://api.blockeden.xyz/base/<your-api-key>

Testnet (Sepolia)

JSON-RPC: https://api.blockeden.xyz/base-sepolia/<your-api-key>
WebSocket: wss://api.blockeden.xyz/base-sepolia/<your-api-key>

Quick Start

Step 1: Get Your API Key

Visit BlockEden.xyz Dashboard
Create a new API key for Base
Select Mainnet or Testnet

Step 2: Test Connection

Get Latest Block Number

curl -X POST https://api.blockeden.xyz/base/<your-api-key> \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_blockNumber",
    "params": [],
    "id": 1
  }'

Get Account Balance

curl -X POST https://api.blockeden.xyz/base/<your-api-key> \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getBalance",
    "params": ["0x742D5Cc6bF2442E8C7c74c7b4Be6AB9d6f10f5B4", "latest"],
    "id": 1
  }'

Get Gas Price

curl -X POST https://api.blockeden.xyz/base/<your-api-key> \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_gasPrice",
    "params": [],
    "id": 1
  }'

Supported API Methods

Core JSON-RPC Methods

All standard Ethereum JSON-RPC methods are supported:

Account Methods: eth_getBalance, eth_getTransactionCount, eth_getCode
Block Methods: eth_blockNumber, eth_getBlockByNumber, eth_getBlockByHash
Transaction Methods: eth_sendRawTransaction, eth_getTransactionReceipt
Contract Methods: eth_call, eth_estimateGas, eth_getLogs
Gas Methods: eth_gasPrice, eth_feeHistory, eth_maxPriorityFeePerGas
Network Methods: eth_chainId, net_version

Layer 2 Specific Methods

L1 to L2 Messages: Track cross-layer transactions
L2 to L1 Withdrawals: Monitor withdrawal status
Gas Estimation: Optimized for L2 fee structure

Code Examples

JavaScript/TypeScript

// Using ethers.js with Base
import { ethers } from 'ethers';

const provider = new ethers.JsonRpcProvider('https://api.blockeden.xyz/base/<your-api-key>');

// Get latest block
const blockNumber = await provider.getBlockNumber();
console.log('Latest block:', blockNumber);

// Get account balance
const balance = await provider.getBalance('0x742D5Cc6bF2442E8C7c74c7b4Be6AB9d6f10f5B4');
console.log('Balance:', ethers.formatEther(balance), 'ETH');

// Get current gas price
const gasPrice = await provider.getFeeData();
console.log('Gas price:', ethers.formatUnits(gasPrice.gasPrice, 'gwei'), 'gwei');

// Deploy a contract to Base
const contractFactory = new ethers.ContractFactory(abi, bytecode, wallet);
const contract = await contractFactory.deploy({
  gasLimit: 1000000,
  // Base uses very low gas prices
  gasPrice: ethers.parseUnits('0.001', 'gwei')
});

await contract.waitForDeployment();
console.log('Contract deployed to:', await contract.getAddress());

Python

import requests
from web3 import Web3

# Connect to Base
w3 = Web3(Web3.HTTPProvider('https://api.blockeden.xyz/base/<your-api-key>'))

# Check connection
print(f"Connected: {w3.is_connected()}")
print(f"Chain ID: {w3.eth.chain_id}")
print(f"Latest block: {w3.eth.block_number}")

# Get account balance
balance = w3.eth.get_balance('0x742D5Cc6bF2442E8C7c74c7b4Be6AB9d6f10f5B4')
print(f"Balance: {w3.from_wei(balance, 'ether')} ETH")

# Get gas price
gas_price = w3.eth.gas_price
print(f"Gas price: {w3.from_wei(gas_price, 'gwei')} gwei")

Go

package main

import (
    "context"
    "fmt"
    "log"
    "math/big"

    "github.com/ethereum/go-ethereum/ethclient"
    "github.com/ethereum/go-ethereum/common"
)

func main() {
    // Connect to Base
    client, err := ethclient.Dial("https://api.blockeden.xyz/base/<your-api-key>")
    if err != nil {
        log.Fatal(err)
    }

    // Get latest block number
    header, err := client.HeaderByNumber(context.Background(), nil)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Printf("Latest block: %s\n", header.Number.String())

    // Get account balance
    account := common.HexToAddress("0x742D5Cc6bF2442E8C7c74c7b4Be6AB9d6f10f5B4")
    balance, err := client.BalanceAt(context.Background(), account, nil)
    if err != nil {
        log.Fatal(err)
    }

    balanceInEth := new(big.Float)
    balanceInEth.SetString(balance.String())
    balanceInEth = balanceInEth.Quo(balanceInEth, big.NewFloat(1e18))
    fmt.Printf("Balance: %f ETH\n", balanceInEth)
}

Authentication

All API requests require your API key in the URL path:

https://api.blockeden.xyz/base/<your-api-key>

Example:

https://api.blockeden.xyz/base/abc123def456/

Rate Limits

Free Tier: 100 requests/second, 86,400 requests/day
Pro Tier: 1,000 requests/second, 10M requests/day
Enterprise: Custom limits based on your needs

Rate limit headers are included in responses:

X-RateLimit-Limit: 100
X-RateLimit-Remaining: 99
X-RateLimit-Reset: 1640995200

Network Information

Mainnet

Chain ID: 8453
Native Token: ETH (18 decimals)
Block Time: ~2 seconds
Explorer: https://basescan.org

Testnet (Base Sepolia)

Chain ID: 84532
Native Token: ETH (18 decimals)
Faucet: https://www.coinbase.com/faucets/base-ethereum-sepolia-faucet

Layer 2 Benefits

Ultra-Low Transaction Costs

// Example transaction costs on Base vs Ethereum
const estimateGas = async () => {
  const gasLimit = await contract.estimateGas.transfer(recipient, amount);
  const gasPrice = await provider.getFeeData();

  // Base: typically 0.001-0.01 gwei
  const baseCost = gasLimit * gasPrice.gasPrice;
  console.log(`Transaction cost: ${ethers.formatEther(baseCost)} ETH`);
  // Usually less than \$0.01
};

Fast Finality

Soft Finality: ~2 seconds on Base
Hard Finality: ~7 days (L1 challenge period)
Practical Finality: Immediate for most applications

Ethereum Security

Inherits Ethereum's security model
Fraud proofs ensure transaction validity
Decentralized sequencer (roadmap)

WebSocket Subscriptions

Real-time data streaming for Base network events:

const ws = new WebSocket('wss://api.blockeden.xyz/base/<your-api-key>');

ws.onopen = () => {
  // Subscribe to new blocks
  ws.send(JSON.stringify({
    jsonrpc: '2.0',
    method: 'eth_subscribe',
    params: ['newHeads'],
    id: 1
  }));

  // Subscribe to pending transactions
  ws.send(JSON.stringify({
    jsonrpc: '2.0',
    method: 'eth_subscribe',
    params: ['newPendingTransactions'],
    id: 2
  }));
};

ws.onmessage = (event) => {
  const data = JSON.parse(event.data);
  console.log('New event:', data);
};

Error Handling

Common HTTP Status Codes

200: Success
400: Bad Request (invalid JSON or parameters)
401: Unauthorized (invalid API key)
429: Too Many Requests (rate limit exceeded)
500: Internal Server Error

JSON-RPC Error Codes

-32700: Parse error
-32600: Invalid Request
-32601: Method not found
-32602: Invalid params
-32603: Internal error
-32000: Server error

Example Error Response

{
  "jsonrpc": "2.0",
  "error": {
    "code": -32602,
    "message": "Invalid params",
    "data": "Missing required parameter"
  },
  "id": 1
}

Best Practices

Gas Optimization for L2

// Use appropriate gas settings for Base
const transaction = {
  to: recipient,
  value: ethers.parseEther("0.1"),
  gasLimit: 21000,
  // Base typically uses very low gas prices
  gasPrice: ethers.parseUnits("0.001", "gwei")
};

// Or use EIP-1559 for better UX
const transaction1559 = {
  to: recipient,
  value: ethers.parseEther("0.1"),
  gasLimit: 21000,
  maxFeePerGas: ethers.parseUnits("0.01", "gwei"),
  maxPriorityFeePerGas: ethers.parseUnits("0.001", "gwei")
};

Error Handling with Retries

async function makeRequest(method, params, retries = 3) {
  for (let i = 0; i < retries; i++) {
    try {
      const response = await fetch('https://api.blockeden.xyz/base/<your-api-key>', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ jsonrpc: '2.0', method, params, id: 1 })
      });

      if (!response.ok) {
        throw new Error(`HTTP ${response.status}: ${response.statusText}`);
      }

      const data = await response.json();
      if (data.error) {
        throw new Error(`RPC Error ${data.error.code}: ${data.error.message}`);
      }

      return data.result;
    } catch (error) {
      if (i === retries - 1) throw error;
      await new Promise(resolve => setTimeout(resolve, 1000 * Math.pow(2, i)));
    }
  }
}

Contract Deployment

// Deploy contracts efficiently on Base
async function deployContract(factory, args = []) {
  // Get current gas price
  const feeData = await provider.getFeeData();

  const contract = await factory.deploy(...args, {
    gasLimit: 3000000,
    maxFeePerGas: feeData.maxFeePerGas,
    maxPriorityFeePerGas: feeData.maxPriorityFeePerGas
  });

  // Wait for deployment
  const receipt = await contract.waitForDeployment();
  console.log(`Contract deployed to: ${await contract.getAddress()}`);
  console.log(`Transaction hash: ${receipt.deploymentTransaction().hash}`);

  return contract;
}

Common Use Cases

DeFi Applications

DEX trading with minimal fees
Yield farming protocols
Lending and borrowing platforms
Stablecoin transfers

NFT Projects

Low-cost minting
NFT marketplaces
Gaming assets
Social tokens

Payment Systems

Micropayments
Subscription services
Cross-border transfers
Merchant payments

Next Steps

Explore the Base JSON-RPC API Reference for complete method documentation
Learn about Base WebSocket Guide for real-time data streaming
Check out Base L2 Features Guide for Layer 2 specific functionality
Visit BlockEden.xyz Dashboard to monitor your usage

Support

📧 Email: support@blockeden.xyz
💬 Discord: Join our community
🐦 Twitter: @BlockEdenHQ
📊 Status Page: status.blockeden.xyz
📖 API Documentation: docs.blockeden.xyz

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What is Base?​

API Endpoints​

Mainnet​

Testnet (Sepolia)​

Quick Start​

Step 1: Get Your API Key​

Step 2: Test Connection​

Get Latest Block Number​

Get Account Balance​

Get Gas Price​

Supported API Methods​

Core JSON-RPC Methods​

Layer 2 Specific Methods​

Code Examples​

JavaScript/TypeScript​

Python​

Go​

Authentication​

Rate Limits​

Network Information​

Mainnet​

Testnet (Base Sepolia)​

Layer 2 Benefits​

Ultra-Low Transaction Costs​

Fast Finality​

Ethereum Security​

WebSocket Subscriptions​

Error Handling​

Common HTTP Status Codes​

JSON-RPC Error Codes​

Example Error Response​

Best Practices​

Gas Optimization for L2​

Error Handling with Retries​

Contract Deployment​

Common Use Cases​

DeFi Applications​

NFT Projects​

Payment Systems​

Next Steps​

Support​

What is Base?

API Endpoints

Mainnet

Testnet (Sepolia)

Quick Start

Step 1: Get Your API Key

Step 2: Test Connection

Get Latest Block Number

Get Account Balance

Get Gas Price

Supported API Methods

Core JSON-RPC Methods

Layer 2 Specific Methods

Code Examples

JavaScript/TypeScript

Python

Go

Authentication

Rate Limits

Network Information

Mainnet

Testnet (Base Sepolia)

Layer 2 Benefits

Ultra-Low Transaction Costs

Fast Finality

Ethereum Security

WebSocket Subscriptions

Error Handling

Common HTTP Status Codes

JSON-RPC Error Codes

Example Error Response

Best Practices

Gas Optimization for L2

Error Handling with Retries

Contract Deployment

Common Use Cases

DeFi Applications

NFT Projects

Payment Systems

Next Steps

Support